AU692253B2 - Super abrasive grinding wheels - Google Patents
Super abrasive grinding wheels Download PDFInfo
- Publication number
- AU692253B2 AU692253B2 AU23118/95A AU2311895A AU692253B2 AU 692253 B2 AU692253 B2 AU 692253B2 AU 23118/95 A AU23118/95 A AU 23118/95A AU 2311895 A AU2311895 A AU 2311895A AU 692253 B2 AU692253 B2 AU 692253B2
- Authority
- AU
- Australia
- Prior art keywords
- grinding wheel
- document
- wheel according
- grinding
- date
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 239000011230 binding agent Substances 0.000 claims description 16
- 239000011324 bead Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 11
- 239000011521 glass Substances 0.000 claims description 8
- 239000011159 matrix material Substances 0.000 claims description 8
- 239000002671 adjuvant Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 239000010941 cobalt Substances 0.000 claims description 3
- 229910017052 cobalt Inorganic materials 0.000 claims description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 3
- 229910052863 mullite Inorganic materials 0.000 claims description 3
- 229910052582 BN Inorganic materials 0.000 claims description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 2
- 229910000906 Bronze Inorganic materials 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 239000010974 bronze Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims 2
- 229910052751 metal Inorganic materials 0.000 claims 2
- 239000002184 metal Substances 0.000 claims 2
- 101100382267 Caenorhabditis elegans cah-1 gene Proteins 0.000 claims 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims 1
- 150000002739 metals Chemical class 0.000 claims 1
- 239000000428 dust Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000002826 coolant Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241000517645 Abra Species 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 101000635799 Homo sapiens Run domain Beclin-1-interacting and cysteine-rich domain-containing protein Proteins 0.000 description 1
- 102100030852 Run domain Beclin-1-interacting and cysteine-rich domain-containing protein Human genes 0.000 description 1
- 208000024780 Urticaria Diseases 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- PZZYQPZGQPZBDN-UHFFFAOYSA-N aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
- B24B9/10—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
- B24D3/10—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements for porous or cellular structure, e.g. for use with diamonds as abrasives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9404302A FR2718379B3 (fr) | 1994-04-12 | 1994-04-12 | Meules super abrasives. |
FR9404302 | 1994-04-12 | ||
PCT/FR1995/000462 WO1995027592A1 (fr) | 1994-04-12 | 1995-04-11 | Meules super abrasives |
Publications (2)
Publication Number | Publication Date |
---|---|
AU2311895A AU2311895A (en) | 1995-10-30 |
AU692253B2 true AU692253B2 (en) | 1998-06-04 |
Family
ID=9461994
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU23118/95A Ceased AU692253B2 (en) | 1994-04-12 | 1995-04-11 | Super abrasive grinding wheels |
Country Status (13)
Country | Link |
---|---|
US (1) | US5658194A (ko) |
EP (1) | EP0703850A1 (ko) |
JP (1) | JPH08511482A (ko) |
KR (1) | KR960703050A (ko) |
CN (1) | CN1126962A (ko) |
AU (1) | AU692253B2 (ko) |
BR (1) | BR9506149A (ko) |
CA (1) | CA2164613A1 (ko) |
FR (1) | FR2718379B3 (ko) |
PL (1) | PL311956A1 (ko) |
TW (1) | TW268915B (ko) |
WO (1) | WO1995027592A1 (ko) |
ZA (1) | ZA953013B (ko) |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6015338A (en) * | 1997-08-28 | 2000-01-18 | Norton Company | Abrasive tool for grinding needles |
US6440185B2 (en) | 1997-11-28 | 2002-08-27 | Noritake Co., Ltd. | Resinoid grinding wheel |
SG119138A1 (en) * | 1998-04-28 | 2006-02-28 | Ebara Corp | Abrading plate and polishing method using the same |
US6129134A (en) * | 1999-03-11 | 2000-10-10 | The United States Of America As Represented By The Secretary Of The Navy | Synthesis of metal matrix composite |
US6394888B1 (en) | 1999-05-28 | 2002-05-28 | Saint-Gobain Abrasive Technology Company | Abrasive tools for grinding electronic components |
US6860795B2 (en) * | 2001-09-17 | 2005-03-01 | Hitachi Global Storage Technologies Netherlands B.V. | Edge finishing process for glass or ceramic disks used in disk drive data storage devices |
JP4571821B2 (ja) * | 2004-05-19 | 2010-10-27 | 株式会社ディスコ | 電着砥石の製造方法 |
JP4734041B2 (ja) * | 2005-06-15 | 2011-07-27 | 株式会社ディスコ | ビトリファイドボンド砥石の製造方法 |
US8481438B2 (en) * | 2008-06-13 | 2013-07-09 | Washington Mills Management, Inc. | Very low packing density ceramic abrasive grits and methods of producing and using the same |
TWI453089B (zh) * | 2010-08-16 | 2014-09-21 | Saint Gobain Abrasives Inc | 對包含超級磨料材料的工件進行磨削之方法 |
TWI454342B (zh) | 2010-08-16 | 2014-10-01 | Saint Gobain Abrasives Inc | 用於對超級磨料工件進行磨削之磨料物品 |
TWI613285B (zh) | 2010-09-03 | 2018-02-01 | 聖高拜磨料有限公司 | 粘結的磨料物品及形成方法 |
JP5647475B2 (ja) * | 2010-09-28 | 2014-12-24 | AvanStrate株式会社 | ガラス板の製造方法 |
TW201504416A (zh) | 2011-06-30 | 2015-02-01 | Saint Gobain Abrasives Inc | 磨料物品及製造方法 |
JP2016501735A (ja) | 2012-12-31 | 2016-01-21 | サンーゴバン アブレイシブズ,インコーポレイティド | 結合研磨物品および研削方法 |
EP2938460B1 (en) | 2012-12-31 | 2018-08-15 | Saint-Gobain Abrasives, Inc. | Method of grinding |
WO2014106159A1 (en) | 2012-12-31 | 2014-07-03 | Saint-Gobain Abrasives, Inc. | Bonded abrasive article and method of grinding |
EP2783794B1 (de) * | 2013-03-26 | 2017-09-27 | Reishauer AG | Schleifscheibe sowie Verfahren zu ihrer Verstärkung |
US9833877B2 (en) | 2013-03-31 | 2017-12-05 | Saint-Gobain Abrasives, Inc. | Bonded abrasive article and method of grinding |
CN103395009B (zh) * | 2013-07-08 | 2015-07-01 | 中原工学院 | 一种陶瓷空心球多层钎焊金刚石节块及其制作方法 |
GB201523182D0 (en) | 2015-12-31 | 2016-02-17 | Element Six Uk Ltd | Super hard constructions & methods of making same |
CN105834923A (zh) * | 2016-04-22 | 2016-08-10 | 柳州凯通新材料科技有限公司 | 青铜基金刚石砂轮片的加工方法 |
CN106985085B (zh) * | 2017-04-22 | 2019-01-22 | 河南工业大学 | 一种金属结合剂金刚石砂轮 |
CN110900473B (zh) * | 2019-12-11 | 2020-10-27 | 郑州磨料磨具磨削研究所有限公司 | 一种可导电的树脂结合剂砂轮及其制备工艺 |
CN111069708A (zh) * | 2019-12-28 | 2020-04-28 | 大可精密齿轮(浙江)有限公司 | 一种应用于减速器的弧形齿加工工艺 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63256364A (ja) * | 1987-04-11 | 1988-10-24 | F S K:Kk | 多孔質型超砥粒砥石 |
JPH0326467A (ja) * | 1989-06-20 | 1991-02-05 | Agency Of Ind Science & Technol | 多気孔金属ホイールとその製造法 |
JPH03104565A (ja) * | 1989-09-19 | 1991-05-01 | Aisin Seiki Co Ltd | 有気孔メタル砥石の遠心焼成法 |
Family Cites Families (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2811960A (en) * | 1957-02-26 | 1957-11-05 | Fessel Paul | Abrasive cutting body |
US3069816A (en) * | 1959-04-22 | 1962-12-25 | Vanguard Abrasive Corp | Abrasive cut-off disks |
US3183632A (en) * | 1962-07-09 | 1965-05-18 | Gen Motors Corp | Grinding tool |
US3540162A (en) * | 1967-02-23 | 1970-11-17 | Norton Co | Diamond abrasive tool |
US3594141A (en) * | 1967-03-06 | 1971-07-20 | Norton Co | Method for making a metal bonded diamond abrasive tool |
US3756796A (en) * | 1967-12-13 | 1973-09-04 | Super Cut | Method of forming a peripheral grinding wheel |
US3640027A (en) * | 1969-07-25 | 1972-02-08 | Sel Rex Corp | Annular cutting blades |
US3925035A (en) * | 1972-02-22 | 1975-12-09 | Norton Co | Graphite containing metal bonded diamond abrasive wheels |
GB1472282A (en) * | 1973-04-25 | 1977-05-04 | Hedelin L | Eyeglass lens grinding wheel and a method of grinding eyeglass lenses |
US4042347A (en) * | 1974-04-15 | 1977-08-16 | Norton Company | Method of making a resin-metal composite grinding wheel |
US4184854A (en) * | 1978-04-24 | 1980-01-22 | Norton Company | Magnetic cores for diamond or cubic boron nitride grinding wheels |
JPS55104969A (en) * | 1979-01-29 | 1980-08-11 | Mitsubishi Metal Corp | Ceramics for cutting glass |
DE3204276A1 (de) * | 1982-02-08 | 1983-08-18 | J. König GmbH & Co Werkzeugfabrik, Steinindustrie- und Handwerkerbedarf, 7500 Karlsruhe | Diamantbelag mit poroeser innenschicht fuer trennscheiben |
JPS6080562A (ja) * | 1983-10-07 | 1985-05-08 | Disco Abrasive Sys Ltd | 電着砥石 |
JPS6099568A (ja) * | 1983-11-07 | 1985-06-03 | Honda Motor Co Ltd | 多孔質メタルボンド砥石及びその製造方法 |
US4621464A (en) * | 1984-04-30 | 1986-11-11 | Ppg Industries, Inc. | Edging glass sheets with diamond wheels |
JPS61100352A (ja) * | 1984-10-22 | 1986-05-19 | Toyota Banmotsupusu Kk | 研削工具 |
US4634453A (en) * | 1985-05-20 | 1987-01-06 | Norton Company | Ceramic bonded grinding wheel |
SU1653938A1 (ru) * | 1986-12-30 | 1991-06-07 | Московский станкоинструментальный институт | Абразивный круг |
US5090970A (en) * | 1987-09-14 | 1992-02-25 | Norton Company | Bonded abrasive tools with combination of finely microcrystalline aluminous abrasive and a superbrasive |
US4944773A (en) * | 1987-09-14 | 1990-07-31 | Norton Company | Bonded abrasive tools with combination of finely microcrystalline aluminous abrasive and a superabrasive |
JPH072307B2 (ja) * | 1988-09-13 | 1995-01-18 | 旭ダイヤモンド工業株式会社 | メタルボンドダイヤモンド砥石 |
US5049164A (en) * | 1990-01-05 | 1991-09-17 | Norton Company | Multilayer coated abrasive element for bonding to a backing |
US5443418A (en) * | 1993-03-29 | 1995-08-22 | Norton Company | Superabrasive tool |
US5385591A (en) * | 1993-09-29 | 1995-01-31 | Norton Company | Metal bond and metal bonded abrasive articles |
-
1994
- 1994-04-12 FR FR9404302A patent/FR2718379B3/fr not_active Expired - Fee Related
-
1995
- 1995-04-11 CA CA002164613A patent/CA2164613A1/fr not_active Abandoned
- 1995-04-11 KR KR1019950705604A patent/KR960703050A/ko not_active Withdrawn
- 1995-04-11 WO PCT/FR1995/000462 patent/WO1995027592A1/fr not_active Application Discontinuation
- 1995-04-11 AU AU23118/95A patent/AU692253B2/en not_active Ceased
- 1995-04-11 US US08/549,819 patent/US5658194A/en not_active Expired - Lifetime
- 1995-04-11 CN CN95190289A patent/CN1126962A/zh active Pending
- 1995-04-11 PL PL95311956A patent/PL311956A1/xx unknown
- 1995-04-11 JP JP7526133A patent/JPH08511482A/ja active Pending
- 1995-04-11 EP EP95916738A patent/EP0703850A1/fr not_active Withdrawn
- 1995-04-11 BR BR9506149A patent/BR9506149A/pt not_active Application Discontinuation
- 1995-04-12 ZA ZA953013A patent/ZA953013B/xx unknown
- 1995-04-29 TW TW084104282A patent/TW268915B/zh active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63256364A (ja) * | 1987-04-11 | 1988-10-24 | F S K:Kk | 多孔質型超砥粒砥石 |
JPH0326467A (ja) * | 1989-06-20 | 1991-02-05 | Agency Of Ind Science & Technol | 多気孔金属ホイールとその製造法 |
JPH03104565A (ja) * | 1989-09-19 | 1991-05-01 | Aisin Seiki Co Ltd | 有気孔メタル砥石の遠心焼成法 |
Also Published As
Publication number | Publication date |
---|---|
KR960703050A (ko) | 1996-06-19 |
PL311956A1 (en) | 1996-03-18 |
CN1126962A (zh) | 1996-07-17 |
MX9505206A (es) | 1998-03-31 |
TW268915B (ko) | 1996-01-21 |
EP0703850A1 (fr) | 1996-04-03 |
CA2164613A1 (fr) | 1995-10-19 |
AU2311895A (en) | 1995-10-30 |
FR2718379B3 (fr) | 1996-05-24 |
BR9506149A (pt) | 1996-04-16 |
FR2718379A1 (fr) | 1995-10-13 |
WO1995027592A1 (fr) | 1995-10-19 |
JPH08511482A (ja) | 1996-12-03 |
US5658194A (en) | 1997-08-19 |
ZA953013B (en) | 1996-01-05 |
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